#tips{
	width:260px;
	height:50px;
	margin-right: 20px;
	margin-top: 10px;
	
}
#tips li{
	width:50px;
	float:left;
	list-style-type:none;
	 text-align:center; 
}
#books{
	width:800px;
	padding: 0 auto;
	border:1px solid #aaa;
}
.book_list{
	width:700px;
	height:300px;
	padding-left: 80px;
	
}
.book_list div{
	width:150px;
	height:270px;
	float:left;
	border:1px solid #ff8c00;
	
}
.tip{
	height:200px;
	width:500px;

}
.tip div{
	width:70px;
	height:30px;
	float:left;
	border:1px solid #ff8c00;
	padding: 0 auto;
}